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Index

SymbolsTransformerRelayPower-SystemBasic-electricalACSR-ConductorCircuit-BreakerInterview-questions-of-Basic-ElectricityInterview-questions-of-transformerInsulatorCurrent-TransformerMCQMCQ-powersystemThermal-power-stationInterview-questions-of-Power-SystemPower-ElectronicsInterview-questions-of-Underground-CableInterview-questions-of-IlluminationIlluminationMCQ-of-ElectronicsMCQ-of-Basic-ElectricalMCQ-of-Transformers MCQ-of-D.C-motor MCQ-of-D.C-generators

Multiple Choice Question (MCQ) of Induction Motors page-6

51. The complete circuit diagram of a 3-phase induction motor can be drawn with the help of

a) Block rotor test alone.
b) Running-light and blocked-rotor and stator-resistance tests
c) Both running-light and blocked-rotor tests
d) Running-light test alone

Ans: (b)

52. Which of the following motors is most suitable for best speed control?

a) Dc shunt motor
b) Dc series motor
c) Induction motor
d) Synchronous motor

Ans: (a)

53. A SCIM runs at constant speed only so long as

a) Stator flux remains constant
b) Its torque exactly equals the mechanical load
c) Its supply voltage remains constant
d) Torque developed by it remains constant

Ans: (b)

54. If the frequency of input power to an induction motor increases, the rotor copper loss

a) Decreases
b) Increases
c) Remains the same
d) None of these

Ans: (b)

55. The synchronous speed of a linear induction motor does NOT depend on

a) Width of pole pitch
b) Number of poles
c) Supply frequency
d) Any of the above

Ans: (a)

56. The stator frame in an induction motor is used

a) To provide ventilation to the armature
b) To protect the whole machine
c) To hole the armature stampings/stator
d) As a return path for the flux

Ans: (d)

57.If the stator voltage and frequency of an induction motor are reduced proportionately, its

a) Locked rotor current is reduced
b) Torque developed is increased
c) Magnetizing current is decreased
d) Both (a) and (b)

Ans: (d)

58. Motor A has deeper and narrow slots, whereas motor B. It has shallow and wide slots. Induction motor A, as compared to motor B, has

a) More operating slip
b) Lass starting torque
c) More pull-out torque
d) More starting torque

Ans: (b)

59. If a single phase motor runs hot. The probable cause may be

a) Overload
b) Low voltage
c) High voltage
d) Amu pf the above

Ans: (d)

60. Which of the following single phase motors is relatively free from mechanical and magnetic vibration?

a) Reluctance motor
b) Hysteresis motor
c) Universal motor
d) Shaded pole motor

Ans: (b)

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